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  1. 400ex Crankcase Cover Compatibility and Top End Differences - 99-04 and 05-07 - Before and After Reverse

    Repair & Maintenance
    The gasket kits are different due to reverse components, I get, but are the crankcase covers any different? For example, will a 2002 right and left side cover fit on a 2007 crankcase? Will only the left cover work? What are the differences between motor components between these two groups of...